/The other day I took my tracker IV to the river I was going along the shore and had it in about 3 feet. just below the control box, I thought if It still works after this I will be happy, but after I was done and walking up the rock enbankment, I tripped and my detector flew , crashed to the ground and I thought it was dead for sure. But no sooner had I gotten my bearings, it worked just find, Luckily. I have to say their are better models, but the tracker is a good utliltarian detector. smg